21250616 has 16 divisors (see below), whose sum is σ = 39951240. Its totient is φ = 10596960.

The previous prime is 21250589. The next prime is 21250637. The reversal of 21250616 is 61605212.

It is a junction number, because it is equal to n+sod(n) for n = 21250591 and 21250600.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 170 + ... + 6521.

Almost surely, 2^21250616 is an apocalyptic number.

It is an amenable number.

21250616 is a deficient number, since it is larger than the sum of its proper divisors (18700624).

21250616 is a wasteful number, since it uses less digits than its factorization.

21250616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7094 (or 7090 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 21250616 is about 4609.8390427432. The cubic root of 21250616 is about 276.9855892271.

Adding to 21250616 its reverse (61605212), we get a palindrome (82855828).

The spelling of 21250616 in words is "twenty-one million, two hundred fifty thousand, six hundred sixteen".